Grinding machine



Sept. 22, 1925a J. N-4 HEALD ET AL.

GRINDING MACHINE 2 Sheets--Sheet 1 Filed Deo. l1. 1922 EzdveZw-s Sept. 22, 1925.

J. N. HEALD ET AL GRINDING MACHINE Filed Dec:v 11, 1922 2 Sheets-Sheet 2 lill/1111i',

Patented Sept. 22, `1925.

NITED STATES 1,554,847 mi'rEVrl OFFICE.

JAMES N. HEALD AND ALBERT TURNER, OF WORCESTER, MASSACHUSETTS, ASSIGNORS T0 THE HEALDYKMACHINE COMPANY, 0F

PORATION 0F MASSACHUSETTS.

WORCESTER, MASSACHUSETTS, A COR- GRINDING MACHINE.

Application led December 11, 1922. Serial No. 606,141.

To all whomy t may concern:

Be it known that we, JAMES N. HEALD and ALBERT TURNER, both citizens of the United States, residing at `Worcester, in the county of Worcester and Commonwealth of Massachusetts, have invented certain new and useful Improvements in a Grinding Machine, of which the following, together with the accompanying drawings, is a specification.

rll`he present invention relates to grinding machines. The invention resides in the novel combination and arrangement of parts hereinafter fully described, of especial utility in the construction and operation of a plain grinding machine adapted to operate on cylindrical or similar surfaces, namely, a machine of the type disclosed, for instance, 'in our copending companion application, Serial No. 574,940, filed July 14, 1922.

In the accompanying drawings,

Fig. 1 is an end view of sucha machine.

Fig. 2 is an enlarged sectional view of the head stock of the machine, showing certan features of the invention.

Fig. 3 is a sectional view on the line 3f-3, Fig. 2. v

Fig. 4 is a sectional view on the line 4-4, Fig. 2.

Fig. 5 is a face view of the head stock, showing the mode of imparting rotation to the work.

Fig. 6 is a sectional view on the line 6 6, Fig. 5.

Fig.y 7 is a sectional View of reduction gearing, constituting a modification of the gearing shown in Fig. 2.

Fig. 8 is a view similar to Fig. 2, showing the use of such reduction gearing in the head stock, for imparting rotation to the work.

Like reference 'characters krefer to like parts in the different figures.

In a machine of this type, as disclosed in the aforesaid copending application, the frame or base 1 carries a wheel slide 2, `the latter being transversely movable in suitable ways, not shown. The slide 2 has journalled therein the spindle of a grinding wheel 3, which is adapted to be rotated at high speed by any suitable means, such as a belt 4 connecting the wheel pulley 5 with a' driving pulley 6L The usual adjustment of the wheel slide 2 in its ways, for the purpose of positioning the wheel 3 for different sizes of work, is accomplished in any well known manner, as by means of a hand wheel, not shown, which operates through a screw or other means, not shown, to obtain the cross feedI of the wheel 3; and the driving belt 4 is enabled to accommodate itself to this cross feed through the'action of a tightener pulley 7, as disclosed in the aforesaid application.

On the front part of the machine frame, provision is made ,for supporting and for rotating the work to be ground, which, in accordance with the particular type of machine here shown, lis adapted to be given a back and forth longitudinal movement in lcontact with the periphery of the grinding wheel 3. To this end, the machine frame provides longitudinal ways 8, 8 for a sliding table 9, the movement of which -is obtained, for instance, by a fluid pressure' controlling and reversing mechanism, not here shown, since it forms no part of the present invention, but which may be of the type disclosed in our aforesaid application and also in the copending a plication of Drake and Hubbell, Serial 1rlo. 528,118, filed January t), 192,2. Such mechanism secures automatically the reciprocation of the slide or table 9, and with it the head stock 10 and the tail stock, not shown, both adjustably carried by said table.

The attachment of head stock. 10 to the slide or `table 9 iseii'ected by a binder .or clamp bolt 11, Fig. 2, said bolt having its head '12 seated in a socket 13 provided by a depending member 14 which is pivoted at 15 to the body of the head stock 10. The tightening of a nut 11 carried by this bolt draws the pivoted depending member 14 into {rm engagement with the edge of the table 9, and thus causes the head stock to bind on the table on opposite sides thereof, to hold-it firmly in any desired position of adjustment'.

The head stock 10 supports the usual work center 16, cooperating with a similar center in the tail stock, not shown. Also journalled in the head stock is a work driving plate 17 and, in the form of the invention shown in Figs. 2, 3 and 4, said plate 17 is adapted to have rotation imparted thereto by means of a Worm gear 18, surrounding the center pin 16, and in mesh with a worm 19 on a countershaft 20. vSaid countershaft 2() itself car.

- 4. The arrangement of parts in said head stock is such as to obtain these two worm gear reductions for the driving plate 17 in a minimum of space and, to this end, the work center 16 is made to terminate short in the head stock, as shown in Fig. 4, thus allowing the motor casing 24 to be disposed immediately behind and below the innerend of said center pin.

. The driving plate 17 which rotates about the axis of center pin 16 is made in two parts, namely, an outer circular portion 25 attached to the worm gear 18 by suitable screws 26, and an inner adjustable portion 27, the latter being movable in suitable undercut ways 28 provided by the portion 25. Said portion 27 provides a slot 29l for the passage of the center pin 16,'said slot being elongated to accommodate said pin over the range of adjustment of portion 27. The latter is shiftable in and out to dispose a driving pin 30, carried thereby, in operative relation to various sizes of work, and'is fixed in position by a sleeve 31 and countersunk screw 32. The driving pin 30 is insertible in a' taper socket 33, adapted to be tightened or loosened byia handle 33.

s shown in Fig..7, a modification of the y reduction gearing from the motor shaft 34 unvol've's the attachment to said motor shaft of an eccentric hub 35, having journalled thereon a pair of integrally united concentric gears 36 and 37, the smaller of which, 36, runs in mesh with an internal gear 38, fixed to the stationary motor casing, and the largest of which, 37, runs in mesh with an internal gear 39, forming part'of a driven element that is journalled on the outer end of the motor shaft. Said driven element carries a sprocket wheel 40, and as shown in Fig. 8, a sprocket chain 41 connects the same with a sprocket wheel 42 disposed concentrically to the center pin 16 and connected in any suitable way to the driving plate 17,

to rotate the latter. By the above described double reduction mechanism, involving spur and internal gears instead of the Wormvgears shown in Fig. 2, the same reduction of speed between the motor and the driving plate is enabled to be secured, in a head stock of much smaller size, and without the use of countershafting.

We claim,

1. In a grinding machine, a movable headstock having a center for supporting the work to be ground, and a motor carried by said he'adstock for-rotating the work on the axis provided by said center, t-he latter terminating invariably in front of said motor,

topermit support of said motor near the bottom of said headstock.

2. In a grinding machine, 'a movable headstock, a motor carried thereby for rotating the work, and a center pin for said work disposed wholly in one end of said headstock, whereby to terminate short of the casing of said motor. j

3. In a grinding machine headstock, a rotatable driving plate having a lradially adjust-able section, and a work-drive pin carried thereby to engage the work at variable distances from the axis of rotation of said plate. A

4. In a grinding machine headstock, a rotaftable driving plate having a radially adjustable section, and a work-drive pin carried thereby to engage the work at variable distances fromv the axis of rotation of said plate, said section being slotted for the passage vof a center pin carried by said vheadstock.

5. In a grinding machine headstock, a motor and a driving plate for the work, in combination with a pair of spur gears, of different diameter rigidly attached together, means causing the center of, saidk gears to revolve orbita-lly about a shaft, and means including a stationary ring gear and a revoluble ring gear, both meshing with said spur gears, whereby said plate is driven from said motor at a reduced rate of speed.

JAMES- N. HEALD. ALBERT TURNER. 

